- Laboratory Equipment Repair & Service, Du Bois
- Land Surveyor, Du Bois - Land Surveying Services
- Landscape Contractors & Designers, Du Bois
- Landscape Lighting, Du Bois
- Landscaping, Du Bois
- Landscaping Materials & Supplies, Du Bois
- Laser Equipment Repair & Service, Du Bois
- Laser Game Centers, Du Bois
- Laser Printers, Du Bois - Office Supplies
- Late Night Restaurants, Du Bois
- Lawn & Garden Equipment & Supplies, Du Bois
- Lawn & Garden Services, Du Bois
- Lawn Maintenance Services, Du Bois
- Lawn Mower Repair & Blade Sharpening Service, Du Bois
- Lawn Mowers & Power Equipment, Du Bois
- Lawyers & Attorneys, Du Bois
- Legal & Tax Services, Du Bois
- Legal Professionals, Du Bois
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- Libraries, Du Bois
- Life Insurance, Du Bois
- Lighting Fixtures & Equipment, Du Bois
- Linen Supply Services, Du Bois
- Lions Clubs, Du Bois
- Liquor Stores, Du Bois
- Livestock, Du Bois
- Loans Personal, Du Bois
- Locks, Du Bois
- Locksmiths, Du Bois - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Du Bois
- Lodging, Du Bois
- Loggers, Du Bois
- Long Haul Trucking Companies, Du Bois
- Lumber & Lumber Products, Du Bois
- Lumber & Lumber Products, Du Bois
- Lutheran Church, Du Bois
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